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Table 1 Comparison of ambient air pollutant concentrations between Fresno and Palo Alto, CA, based on California Air Resources Board (CARB) compliance monitoring for 2011

From: Secondhand smoke in combination with ambient air pollution exposure is associated with increasedx CpG methylation and decreased expression of IFN-γ in T effector cells and Foxp3 in T regulatory cells in children

Pollutant

Location of compliance monitor

Redwood City*

First Street, Fresno

PAHs, annual average (ng/m 3 )

84

1,068

PM 2.5 , annual average (μg/m 3 )

Insufficient data

15.9

PM 2.5 , 24-h maximum (μg/m 3 )

24.0

78.5

PM 10 , annual average (μg/m 3 )

Insufficient data

29.6

PM 10 , 24-h high (μg/m 3 )

Insufficient data

99.5

O 3 , highest 8-h average (ppb)

62

97

O 3 , number of days > state 1-h standard

0

14

O 3 , number of days > state 8-h standard

0

54

  1. PM2.5, particulate matter with aerodynamic diameter ≤ 2.5 μm; PM10, particulate matter with aerodynamic diameter ≤10 μm; PAH, polycyclic aromatic hydrocarbon; O3, ozone.
  2. *Redwood City is the nearest compliance monitor, within 4.7 km of the Palo Alto residences of the Stanford cohort. All Fresno subjects live within a circle with the First Street monitor as its center and a radius of 20 km.
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Clinical Epigenetics

ISSN: 1868-7083

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